Listening device



FIG. 1 is a perspective view of a listening device showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a perspective view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are for illustrative purpose only and do not form part of the claimed design. 

The ornamental design for a listening device, as shown and described. 